US7145476B2 - 2-wire push button station control system for a traffic light controlled intersection - Google Patents
2-wire push button station control system for a traffic light controlled intersection Download PDFInfo
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- US7145476B2 US7145476B2 US10/911,655 US91165504A US7145476B2 US 7145476 B2 US7145476 B2 US 7145476B2 US 91165504 A US91165504 A US 91165504A US 7145476 B2 US7145476 B2 US 7145476B2
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/07—Controlling traffic signals
Definitions
- the pedestrian accessible signaling means has typically been powered at each corner of an intersection by the 115 VAC available at each existing pedestrian lighted sign.
- this approach does not require that additional wires be pulled from each push button station to the traffic control cabinet, the resulting disadvantage is that each push button station operates independently of the others so that sounds cannot be coordinated or synchronized for optimum audible and vibro-tactile presentation to visually impaired pedestrians.
- intersections can be significant as a result of having to install new underground wiring to the push button stations in order to enable the additional signal function to be generated and made accessible to visually impaired pedestrians following the depression of a push button.
- most intersections already contain previously installed pairs of wires that run underground from the existing push button stations to a remote traffic light control box.
- cost sensitive cities would be able to avoid many of the expenditures and inconveniences of having to pull additional wires or even dig trenches and lay new field wires in order to install the new push button stations for each intersection if a control system were available that could incorporate the existing underground wire pairs to transmit power and data signals in order to generate the accessible signal functions for both sighted and visually impaired pedestrians.
- FIG. 1 shows a 4-way traffic light controlled intersection and eight pedestrian activated, pole mounted push button stations connected to a traffic light control cabinet via pairs of underground wires over which power and data signals are transmitted;
- FIG. 3 is a block diagram showing a 2-wire central control unit of the traffic light control cabinet connected to the push button stations via the underground wire run of FIGS. 1 and 2 ;
- FIG. 5 is a block diagram to detail one of the pedestrian activated push button stations of FIGS. 1 and 2 to receive both audible and tactile pedestrian accessible signals.
- FIGS. 1 and 2 of the drawings illustrate a 4-way traffic light controlled intersection having eight (e.g., pole mounted) push button stations 1 - 1 . . . 1 - 8 located at opposite sides of four crosswalks, designated A, B, C and D, and traffic light control hardware located at a traffic light control cabinet 10 and interconnected to the push button stations via existing (i.e., previously laid) push button wiring that typically runs underground.
- 1 and 2 are installed for a standard 4-way traffic light controlled intersection, where one push button station is located at each end of a crosswalk for controlling the flow of vehicular traffic, it is to be understood that a different number of push button stations for complex intersections or intersections with pedestrian islands may also be used to provide audible and tactile information by which to enable both sighted and visually impaired pedestrians to cross an intersection once vehicular traffic has been halted.
- the remote traffic light control cabinet 10 to which a pair of wires is connected from each crosswalk A–D of the pole mounted push button stations 1 - 1 . . . 1 - 8 includes a conventional traffic signal light controller 12 .
- the controller 12 is adapted to recognize the activation (i.e., depression) of one of the push button heads (designated 80 in FIG. 5 ) in response to a pedestrian request so as to operate the traffic light which controls traffic and pedestrian access to the intersection.
- the traffic light control cabinet 10 also includes a 2-wire central control unit 14 that is connected to the traffic signal light controller 12 by a bundle of control connections 16 .
- Control unit 14 as well as the push button stations 1 - 1 . . . 1 - 8 are powered by a 115 volt AC line voltage.
- the central control unit 14 applies pedestrian requests entered at the push button stations 1 - 1 . . . 1 - 8 on crosswalks A–D to the traffic signal light controller 12 so as to generate tactile, audible and visual signals which inform both sighted and visually impaired pedestrians when to WALK or DON'T WALK into the crosswalks of the traffic light controlled intersection.
- the central control unit 14 is connected to the underground push button wiring at 2-wire output ports, designated A′, B′, C′ and D′.
- the control unit 14 includes a common (i.e., ground) port for connection to one line which is common to each of the push button stations 1 - 1 . . . 1 - 8 .
- the number (e.g., four) of on/off controls 22 - 1 . . . 22 - 4 of the central control unit 14 is equal to the number of crosswalks A–D in FIGS. 1 and 2 to be controlled and the corresponding number of pairs of push button stations 1 - 1 and 1 - 2 . . . 1 - 7 and 1 - 8 located at the opposite ends of each crosswalk.
- the 24 volt DC output signal from power supply 20 is also applied to a power interface 26 where the 24 volt DC signal is converted to a 5 volt DC output signal for powering the remaining circuitry of central control unit 14 .
- the 2-wire central control unit 14 at the traffic light control cabinet 10 of FIGS. 1 and 2 is controlled by a suitable microcontroller 30 , such as that manufactured by Microchip Technology of Phoenix, Ariz. under Part No. PIC 18F452.
- a pair of pins (e.g., designated 32 and 34 ) of the microcontroller 30 is dedicated to each of the on/off controls 22 - 1 . . . 22 - 4 .
- One of the pins 32 that is connected to a first on/off control 22 - 1 receives an indication of the voltage at a first of the output ports A′ associated with a first of the push button stations A of the traffic light controlled intersection.
- the first on/off control 22 - 1 checks for a system fault condition at output port A′ of central control circuit unit 14 .
- the microcontroller 30 in any case where the voltage at output port A′ is not 24 volts DC (at a maximum of 5 amps), the microcontroller 30 generates a signal at pin 34 , whereby to cause the transistor switch 24 - 1 to open and thereby interrupt the circuit connection between power supply 20 and the output port A′.
- the voltage at output port A′ in this case drops to 0.
- Additional pairs of pins of the microcontroller 30 are dedicated to similar fault monitoring functions with respect to output ports B′, C′ and D′ of central control unit 14 by opening the corresponding switches 24 - 2 , 24 - 3 and 24 - 4 of respective on/off controls 22 - 2 , 22 - 3 and 22 - 4 depending upon predetermined voltage and current monitoring conditions to be described while referring to FIG. 4 .
- the central control unit 14 at the traffic control cabinet 10 of FIGS. 1 and 2 also includes an LED status display 40 which is connected to the microcontroller 30 .
- Display 40 has a bank of light emitting diodes to indicate to workmen in the field the status of each input and output to the microcontroller 30 so as to verify normal system operation as well as fault condition in need of repair.
- the central control unit 14 further includes a set of pedestrian output terminals 44 that are connected between the microcontroller 30 and the traffic signal light controller (designated 12 in FIGS. 1 and 2 ).
- the set of pedestrian output terminals 44 provides output signals that are responsive to the pedestrian requests entered at the push button stations 1 - 1 . . . 1 - 8 at the crosswalks A–D.
- the set of output terminals 44 may include a corresponding set of (e.g., four) relays which are operated by the microcontroller 30 to duplicate the push button functions performed by pedestrians at the push button stations 1 - 1 . . . 1 - 8 .
- the central control unit 14 also includes four pairs of parallel connected DON'T WALK/WALK input terminals 42 (designated DW and W) for the four pairs of push button stations at crosswalks A–D that are interfaced with the traffic signal light controller 12 (also located at the traffic control cabinet 10 of FIGS. 1 and 2 ) via connections 16 .
- the traffic signal light controller 12 also located at the traffic control cabinet 10 of FIGS. 1 and 2 .
- the traffic signal light controller 12 initiates the timing sequence by which a WALK or DON'T WALK visual signal will be illuminated to pedestrians at crosswalks A–D.
- the voltage to illuminate the pedestrian visual signals is supplied to one of the input terminals 42 to be converted to 5 volts DC and then applied to the microcontroller 30 .
- the central control unit 14 receives its timing from the WALK and DON'T WALK signals.
- a set of optional general purpose terminals 46 are connected to the microcontroller 30 to selectively control the functions relating to the audible, visual and tactile signals to be supplied to the push button stations 1 - 1 . . . 1 - 8 .
- Such general purpose terminals may provide (e.g., 24 volt DC) input signals to the microcontroller 30 for such purposes as, for example, to vary the volume of the audible signal or the length of a tactile vibration that is accessible to a pedestrian following his activation of a push button station 1 - 1 . . . 1 - 8 in order to cross an intersection.
- a set of optional general purpose output terminals 48 are also connected to the microcontroller 30 .
- the microcontroller 30 is programmed to provide output signals which, for example, may trigger a flashing device, or some other external event (e.g., a relay), for a predetermined length of time to maximize pedestrian awareness as to the status of vehicular traffic with respect to the intersection to be entered.
- FIG. 4 of the drawings there is shown a block diagram for an on/off control and a data interface (designated 22 - 1 and 28 - 1 ) that are connected between the microcontroller 30 and one output port (designated A′) of the central control unit 14 FIG. 3 .
- the four on/off controls 22 - 1 . . . 22 - 4 and data interfaces 28 - 1 . . . 28 - 4 of control unit 14 are identical. Therefore, for purposes of convenience, only one on/off control 22 - 1 and data interface 28 - 1 will be described in detail while referring to FIG. 4 .
- each on/off control 22 - 1 of the central control unit 14 includes an electronic (e.g., MOSFET transistor) switch 24 - 1 that is connected to a power supply (designated 20 in FIG. 3 ) to receive a 24 volt DC input signal.
- the on/off control 22 - 1 has current and voltage monitoring means to ensure the normal operation of the 2-wire control system. More particularly, a current monitoring and limiting circuit 50 is responsive to the current flowing through a current shunting resistor 52 to control the gate voltage of transistor switch 24 - 1 . Resistor 52 is connected in electrical series with switch 24 - 1 and a 24 VDC input terminal 54 of the on/off control 22 - 1 .
- a 5 volt DC control signal is supplied from a pin (designated 34 in FIG. 3 ) of the microcontroller 30 to the current monitoring and limiting circuit 50 at a transistor ON/OFF control terminal 56 of the on/off control 22 - 1 of central control unit 14 .
- the current monitoring and limiting circuit 50 causes the switch 24 - 1 to be closed (i.e., turned on), whereby the first output port A′ of control unit 14 is provided with an output signal of approximately 24 volts DC to be supplied to the first pair of push button stations 1 - 1 and 1 - 2 at a first crosswalk (designated A in FIGS. 1 and 2 ).
- the current monitoring and limiting circuit 50 causes the resistance of transistor switch 24 - 1 to increase, whereby the output voltage of the central control unit 14 at the output port A′ thereof is correspondingly reduced, an indication of which is transmitted to the first pair of push button stations 1 - 1 and 1 - 2 .
- a predetermined maximum level e.g., 5 amps
- the input to a receiver 68 is connected across the primary winding of transformer 64 .
- the receiver 68 functions as an electronic comparator so as to compare the magnitude of the voltage at the two output terminals of the transformer 64 as the coded data pulses change.
- the output of receiver 68 is connected through a RECEIVE data terminal 70 of data interface 28 - 1 to provide a data signal (e.g., 5 volts DC or 0 volts) to a corresponding pin (designated 72 in FIG. 3 ) of the microcontroller 30 .
- An additional pin designated 74 in FIG.
- the microcontroller 82 of push button 1 - 1 is coupled to each of a microphone amplifier 94 , a sound chip 96 , and an attenuation chip 98 .
- the microphone amplifier 94 is interfaced with a microphone 100 which is capable of listening for ambient noise in the vicinity of push button station 1 - 1 .
- Microcontroller 82 processes an analog signal from the microphone amplifier 94 which is indicative of the background noise generated by traffic and individuals at the intersection being controlled by push button station 1 - 1 at crosswalk A. Prerecorded information is stored in a digital format in the sound chip 96 .
- a volume controlled audible signal is supplied to the audio amplifier 102 which drives the speaker 94 so that the prerecorded sound or message stored in the sound chip 96 will be accessible to a visually impaired pedestrian about to enter crosswalk A so as to verbally alert him to the status of vehicular traffic at the intersection controlled by push button station 1 - 1 .
- the input data supplied to push button station 1 - 1 from central control unit 14 typically initiates the WALK, flashing DON'T WALK, and DON'T WALK visual messages to pedestrians.
- the coded data pulses could be superimposed (i.e., multiplexed) over the power signals.
- Data interface 106 provides a 24 volt DC output signal to a power regulator 110 .
- Power regulator 110 provides 5 volt DC and 3 volt DC output signals to power the microcontroller 82 as well as certain ones of the sound and vibration emitting devices shown in FIG. 5 as part of the 2-wire push button station 1 - 1 .
- the data interface 106 is connected to a voltage monitor 112 .
- Voltage monitor 112 monitors the power signals that are supplied to the 2-wire push button station 1 - 1 from the on/off control 22 - 1 (of FIG. 4 ) via the 2-wire output port A′ of central control unit 14 and the pair of underground wires illustrated in FIGS. 1 and 2 . In the event a threshold voltage indicative of a fault condition is detected, the voltage monitor 112 notifies the microcontroller 82 at an analog pin thereof, whereby the push button station 1 - 1 is disabled and a record of the fault condition is recorded.
- Another digital data signal is provided over outgoing data line 116 from a second pin of the microcontroller 82 to the driver H-bridge of data interface 106 to control the output voltage of the driver H-bridge.
- the driver H-bridge of the data interface 106 functions as a transmitter which communicates with the data interface 28 - 1 of the central control unit 14 of FIG. 3 to send digital data (e.g., by which to indicate that the push button head 80 of push button 1 - 1 has been depressed or released) back to control unit 14 at the 2-wire output port A′ thereof.
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US10/911,655 US7145476B2 (en) | 2004-08-05 | 2004-08-05 | 2-wire push button station control system for a traffic light controlled intersection |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110148660A1 (en) * | 2008-08-19 | 2011-06-23 | Philip Tate | Advanced accessible pedestrian system for signalized traffic intersections |
US8665115B2 (en) | 2010-06-22 | 2014-03-04 | Novax Industries Corporation | Accessible pedestrian signal system |
US8746086B1 (en) * | 2012-12-07 | 2014-06-10 | Thaddeus J. Niemeyer | Extremely low power pressure sensing system using power strobed sensor |
US10026312B1 (en) | 2012-03-22 | 2018-07-17 | Pelco Products, Inc. | Pedestrian pushbutton |
US10096239B2 (en) | 2014-12-31 | 2018-10-09 | Pelco Products, Inc. | Accessible pedestrian pushbutton station |
WO2020142834A1 (en) * | 2019-01-11 | 2020-07-16 | Logisig Inc. | Electrical cabinets and methods using same |
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DE102009030159B4 (en) * | 2009-06-24 | 2012-04-19 | Langmatz Gmbh | Request device for a traffic light |
DE102009031808B4 (en) * | 2009-07-03 | 2012-04-19 | Langmatz Gmbh | Request device for a traffic light |
JP5629661B2 (en) * | 2011-09-01 | 2014-11-26 | 株式会社京三製作所 | Traffic signal control system |
DE102012024182B4 (en) * | 2012-12-11 | 2017-08-31 | Langmatz Gmbh | Pedestrian signal system requirement |
KR101477780B1 (en) * | 2013-05-31 | 2014-12-30 | 주식회사 토페스 | Apparatus for controlling volume of broadcasting in crosswalk and method thereof |
US10699560B2 (en) * | 2014-11-05 | 2020-06-30 | Key2Access inc. | Integrated accessible pedestrian system |
US9836969B2 (en) | 2015-05-29 | 2017-12-05 | Miovision Technologies Incorporated | System and method for connecting traffic intersections |
CN113129619B (en) * | 2021-05-12 | 2023-10-24 | 广东华络电子科技有限公司 | Safety signal lamp control system and method |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110148660A1 (en) * | 2008-08-19 | 2011-06-23 | Philip Tate | Advanced accessible pedestrian system for signalized traffic intersections |
US8797184B2 (en) | 2008-08-19 | 2014-08-05 | University Of Idaho | Advanced accessible pedestrian system for signalized traffic intersections |
US8665115B2 (en) | 2010-06-22 | 2014-03-04 | Novax Industries Corporation | Accessible pedestrian signal system |
US10026312B1 (en) | 2012-03-22 | 2018-07-17 | Pelco Products, Inc. | Pedestrian pushbutton |
US8746086B1 (en) * | 2012-12-07 | 2014-06-10 | Thaddeus J. Niemeyer | Extremely low power pressure sensing system using power strobed sensor |
US10096239B2 (en) | 2014-12-31 | 2018-10-09 | Pelco Products, Inc. | Accessible pedestrian pushbutton station |
WO2020142834A1 (en) * | 2019-01-11 | 2020-07-16 | Logisig Inc. | Electrical cabinets and methods using same |
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